Malicious PDF — malware analysis report

Static analysis result for SHA-256 7db0cdb2f9d36a69…

MALICIOUS

PDF

99.2 KB Created: 2021-09-05 08:07:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 82a8fa887f2565269704fd75e6207954 SHA-1: f5181308cb7bb2878f1a6c548a794acce3879ad3 SHA-256: 7db0cdb2f9d36a69e2029819d273ad9a08387be0f56a817049798ed65cbedcc3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9800

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://crysiq.ru/uplcv?utm_term=kuka+krc2+service+manual PDF link annotation
    • https://fsbulletsandbrass.com/userfiles/files/57525165982.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a5dbf25c689---73544213884.pdfIn PDF document text
    • http://fittbikese.hu/files/file/libunanefajotadeketa.pdfIn PDF document text
    • http://uro-medical.pl/zdjecia/fotki/file/72544161792.pdfIn PDF document text
    • https://mzr-avocats.com/buddha/ckfinder/userfiles/files/79597258661.pdfIn PDF document text
    • http://architettipassarinmarzotto.com/userfiles/files/11676120955.pdfIn PDF document text
    • http://inspiredindianfoundation.org/uploads/60970084598.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b5f96923c8b---vufesazev.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/160948593c62d2---genarunewena.pdfIn PDF document text
    • https://euroroma-bg.org/files/file/12968917557.pdfIn PDF document text
    • http://holmeslawfirm-iowa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/59833727647.pdfIn PDF document text
    • http://gidaero.com/upload/fckeditor/file/piriguromigogi.pdfIn PDF document text
    • http://erex.hu/upload/file/vularizipefobikenire.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160706deeacba4---97895336634.pdfIn PDF document text
    • https://coffotea.com/uploads//files/202108060705103605.pdfIn PDF document text
    • http://easyhypermarket.com/userfiles/file/10895799404.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160be3fcb4e100---31832715332.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/16088babb99857---75529832658.pdfIn PDF document text
    • http://sdes.in/uploads/35667407392.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/16aba7e2439549537359f8032c17c5ed/99898248178.pdfIn PDF document text
    • http://burmeseburmilla-allevamento.com/userfiles/files/74347223149.pdfIn PDF document text
    • http://autoscuolapezzano.it/userfiles/files/fiwotuwakotezavisiko.pdfIn PDF document text
    • http://longthinhphat.net/uploads/files/podovoxefara.pdfIn PDF document text
    • https://contabil-fiscal.ro/mm/file/zoxezuvubawokako.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/95c7d64ca1afcfe572def902593d0864/zizigen.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/be5f23c55e9a207d5e20d5b522a6121f/1096529490.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011b6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B6E 19840 bytes
SHA-256: edcb4e9d833c81879eff790c39b6883eeeffa84c02ed746af39b243806508dd7
font_01_sfnt_off00014f9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F9B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000167b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x167B2 10544 bytes
SHA-256: 892d841e7931a91308145d49a39c89e613e04f4aaf9bf01d180cba94ffe796bf

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